I have a 1999 500 Scrambler 4X4. Bike had been setting. Started it. It was running ruff. Back Firing would not Idle. Pulled Carb. Had it gone thru. Put it back on. Started it. Ran good but Float stuck and Fuel coming out Float Over Flow. Pull Carb back off adjusted Float tried to start it. No Start. Put New Spark Plug in. No Spark No Fire to Plug. Has new Battery. Lights work.
Any Suggestions?

Ok. Thanks Mechanike a lot for the info soon as I get home I will check the Thumb Throttle Play. As it is it turns over and I can hold the Plug in my had and get nothing. What about the Throttle Play effects it?

it shuts off the spark if the throttle runs away,if you disconnect the blk wire off of the cdi box and it runs then its probably the etc or a bad switch.it might be a differant color wire maybe,,,,,,,,,,